1000+ Manufacturing & Production Engineering MCQ for RBI Assistant [Solved]

1. A left hand tool on a lathe cuts most efficiently when it travels
A. From left to right end of the lathe bed
B. From right to left end of the lathe bed
C. With the help of a compound slide
D. Across the bed
Answer : A

2. In drilling aluminium, a drill with
A. Zero helix angle is used
B. Low helix angle is used
C. High helix angle is used
D. Any helix angle can be used
Answer : C

3. The size of abrasive grain required in a grinding wheel depends upon the
A. Amount of material to be removed
B. Hardness of material being ground
C. Finish desired
D. All of these
Answer : B

4. In which of the following machine, the work rotates and the tool is stationary?
A. Vertical boring machine
B. Horizontal boring machine
C. Precision boring machine
D. Jig boring machine
Answer : A

5. In machining metals, chips break due to __________ of work material.
A. Toughness
B. Ductility
C. Elasticity
D. Work hardening
Answer : D

6. A lathe with four steps on the cone pulley and with back-gears will have
A. Four direct speeds
B. Four indirect speeds
C. Four direct and four indirect speeds
D. Eight indirect speeds
Answer : C

7. The cutting tool in a milling machine is mounted on
A. Spindle
B. Arbor
C. Column
D. Knee
Answer : B

8. Shrinkage allowance on pattern is provided to compensate for shrinkage when
A. The temperature of liquid metal drops from pouring to freezing temperature
B. The metal changes from liquid to solid state at freezing temperature
C. The temperature of solid phase drops from freezing to room temperature
D. The temperature of metal drops from pouring to room temperature
Answer : C

9. The tool made of cemented carbide wear out faster at
A. Slow speeds
B. Medium speeds
C. Fast speeds
D. Very fast speeds
Answer : A

10. The obtuse angle, included between the chisel edge and the lip as viewed from the end of a drill, is called
A. Helix or rake angle
B. Point angle
C. Chisel edge angle
D. Lip clearance angle
Answer : C

11. Cutting fluids are used to
A. Cool the tool
B. Improve surface finish
C. Cool the workpiece
D. All of these
Answer : D

12. The addition of lead, sulphur and phosphorus to low carbon steels, help to
A. Reduce built up edge
B. Break up chips
C. Improve machinability
D. All of these
Answer : D

13. The cutting speed is maximum while machining __________ with a high speed steel tool.
A. Cast iron
B. Mild steel
C. Brass
D. Aluminium
Answer : D

14. An expendable pattern is used in
A. Slush casting
B. Squeeze casting
C. Centrifugal casting
D. Investment casting
Answer : D

15. A single point thread cutting tool should ideally hav
A. Zero rake angle
B. Positive rake angle
C. Negative rake angle
D. Point angle
Answer : A

16. In centreless grinding, work place centre will be
A. Above the line joining the two wheel centres
B. Below the line joining the two wheel centres
C. On the line joining the two wheel centres
D. At the intersection of the line joining the wheel centres with the work place plane
Answer : A

17. In American Standard Association (A S A) system, if the tool nomenclature is 8-6-5-5-10-15-2 mm, then the side rake angle will be
A. 5°
B. 6°
C. 8°
D. 10°
Answer : B

18. Surface grinding is done to produce
A. Tapered surface
B. Flat surface
C. Internal cylindrical holes
D. All of these
Answer : B

19. In centreless grinding, the surface speed of regulating wheel is
A. 5 to 15 m/min
B. 15 to 60 m/min
C. 60 to 90 m/min
D. 90 to 120 m/min
Answer : B

20. Which of the following parameters govern the value of shear angle in continuous chip formation?
A. True feed
B. Chip thickness
C. Rake angle of the cutting tool
D. All of these
Answer : D

21. In order to obtain a surface finish in the range of 0.75 ?m to 1.25 ?m , the operation used is called.
A. Grinding
B. Lapping
C. Honing
D. Buffing
Answer : A

22. Dielectric is used in
A. Electrochemical machining
B. Ultrasonic machining
C. Electro discharge machining
D. Laser machining
Answer : C

23. In a shaper, the metal is removed during
A. Forward stroke
B. Return stroke
C. Both the forward and return strokes
D. Neither the forward nor the return stroke
Answer : A

24. Hardness of steel greatly improves with
A. Annealing
B. Cyaniding
C. Normalizing
D. Tempering
Answer : B

25. For fast removal of materials during grinding, a _________ grinding wheel is used.
A. Course grained
B. Fine grained
C. Medium grained
D. None of these
Answer : A

26. Buffing wheels are made of
A. Softer metals
B. Cotton fabric
C. Carbon
D. Graphite
Answer : B

27. Cold working of steel is defined as working
A. At its recrystallisation temperature
B. Above its recrystallisation temperature
C. Below its recrystallisation temperature
D. At two thirds of the melting temperature of the metal
Answer : C

28. In metal cutting, use of low feeds and high cutting speeds is desired when the objective is
A. High metal removal rate
B. Dry machining
C. Use of soft cutting tool
D. Surface finish
Answer : D

29. Which among the NC operations given below are continuous path operations? Arc Welding (AW), Drilling (D), Laser Cutting of Sheet Metal (LC), Milling (M), Punching in Sheet Metal (P), Spot Welding (SW)
A. AW, LC and M
B. AW, D, LC and M
C. D, LC, P and SW
D. D, LC, and SW
Answer : A

30. In a particular type of welding, flux is prepared in the form of a coarse powder and granulated flux is spread over the joint. What is this type of welding process called?
A. Electric arc welding
B. Submerged arc welding
C. MIG welding
D. TIG welding
Answer : B

31. In transverse grinding
A. The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face
B. The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face
C. The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face
D. The work rotates in a fixed position as the wheel feeds to produce cylinders longer than the width of wheel face
Answer : A

32. Tumbler gears in lathe are used to
A. Reduce the spindle speed
B. Cut gears
C. Give desired direction of movement to the lathe carriage
D. Drill a workpiece
Answer : C

33. In a shaper
A. Tool is stationary and work reciprocates
B. Work is stationary and tool reciprocates
C. Tool moves over stationary work
D. Tool moves over reciprocating work
Answer : B

34. In grinding irregular, curved, tapered, convex and concave surfaces, the grinder used is
A. Cylindrical grinder
B. Internal grinder
C. Surface grinder
D. Tool and cutter grinder
Answer : C

35. In order to achieve a specific surface finish in single point turning, the most important factor to be controlled is
A. Depth of cut
B. Cutting speed
C. Feed
D. Tool rake angle
Answer : B

36. It is desired to perform the operations like drilling, reaming, counter-boring etc. on a work piece. Which of the following machine will be used?
A. Sensitive drilling machine
B. Radial drilling machine
C. Gang drilling machine
D. Multiple spindle drilling machine
Answer : C

37. Ceramic cutting tools are
A. Made by cold pressing of aluminium oxide powder
B. Available in the form of tips
C. Brittle and have low bending strength
D. All of these
Answer : D

38. With the same tool life, the maximum material per minute is removed by
A. Increasing the cutting speed
B. Decreasing the cutting speed
C. Increasing the depth of cut
D. Increasing the feed rate
Answer : C

39. The grinding of long, slender shafts or bars is usually done by
A. In-feed grinding
B. Through feed grinding
C. End-feed grinding
D. Any one of these
Answer : B

40. In metal machining, the zone where the heat is generated due to friction between the moving chip and the tool face, is called
A. Friction zone
B. Work-tool contact zone
C. Shear zone
D. None of these
Answer : A

41. If a particular Fe-C alloy contains less than 0.83% carbon, it is called
A. High speed steel
B. Hypo eutectoid steel
C. Hyper eutectoid steel
D. Cast iron
Answer : B

42. In drilling brass, a drill with
A. Zero helix angle is used
B. Low helix angle is used
C. High helix angle is used
D. Any helix angle can be used
Answer : B

43. A right hand tool on a lathe cuts most efficiently when it travels
A. From left to right end of the lathe bed
B. From right to left end of the lathe bed
C. With the help of a compound slide
D. Across the bed
Answer : B

44. Larger end cutting edge angle _________ tool life.
A. Increases
B. Decreases
C. Does not effect
D. None of these
Answer : A

45. In drilling softer materials, the cutting speed is _________ as compared to harder materials.
A. Same
B. Low
C. High
D. None of these
Answer : C

46. A set of eight form relieved milling cutters for each module is provided to enable cutting of gears of different
A. Materials
B. Types of gears
C. Number of teeth
D. Width of gears
Answer : C

47. Glazing in grinding wheels __________ cutting capacity.
A. Has no effect on
B. Increase
C. Decrease
D. None of these
Answer : C

48. In oblique cutting system, the cutting edge of the tool
A. May clear the width of the workpiece
B. May or may not clear the width of the workpiece
C. May not clear the width of the workpiece
D. Should always clear the width of the workpiece
Answer : C

49. The cutting force in punching and blanking operations mainly depends on
A. The modulus of elasticity of metal
B. The shear strength of metal
C. The bulk modulus of metal
D. The yield strength of metal
Answer : B

50. Small nose radius
A. Increases tool life
B. Decreases tool life
C. Produces chipping and decreases tool life
D. Results in excessive stress concentration and greater heat generation
Answer : D